Piloted Shredder offers that same Harvest Golem look at 4, which is nice.
I kinda dislike the way they did the RNG on this card. I don't mind RNG in general, but I like it better when whether the outcome is good or not depends on the situation and how you use it. For example, if Piloted Shredder only dropped 2-drops of similar power like Raptors, Crocs, and Pint-Sized Summoners, that'd be neat--kinda like how Animal Companion works. The wording makes it sound like it could also drop a Captain's Parrot or Millhouse Manastorm, either of which would be pretty awful for one of the players.
I don't think all the Animal Companions are all that close in value. In most common situations, Huffer > Misha >>> Leokk. And I don't think Millhouse/Engi/Parrot ruin the card. There's a LOT of 3/2s and 2/3s and 2/2s and not a ton of things that are too far off of that, so the chances that you'll get the huge RNG boost are like the chances of a Mad Bomber killing a 2/3 or something.
Yes, Leokk is usually not as good as the other two, but at least it's the same ballpark of power, and sometimes it's actually the best result. Nowhere near 1/1 vs 4/4. I'm not saying that Animal Companion has the fairest possible effect, but it's not needlessly swingy, in my opinion. Though at least with the shredder, by specifying the mana cost, they've moved away from Bane of Doom level swinginess, so that's nice.
Webspinner is super swingy
Although I didn't mention Webspinner, it's a great example of a card that is much less swingy than it is random, which is my favourite kind of randomness. The clever thing about Webspinner is giving you the full card, including mana cost and battlecry. Usually this means that the card goodness is at most 1 mana off from what you spend on it, because the cards you get are at least vaguely balanced (except for Captain's Parrot because you don't have pirates in your deck), so at least the tempo swing is limited even though the value swing may be significant.
The thing I find more swingy about the shredder is that by skipping the battlecry, it skips part of what makes the card (vaguely) balanced.
I'm sure shredder will be mostly fine even if it's worth playing. I'm just disappointed that they didn't re-use the clever solution they had for Webspinner. Imagine something like "Deathrattle: Put a random 2-cost minion in your hand. It costs (2) less." OK, Captain's Parrot is still a problem there, but it handles Novice Engineer, Millhouse Manastorm, Succubus, and whatever else.